[shill] Enable dynamic log-level changes

BUG=chromium-os:15515
TEST=install on device, stop flimflam, run shill and use dbus-send to call GetDebugLevel/SetDebugLevel

Change-Id: I449388f26d20524e0883c51569beeae23f7b64d2
Reviewed-on: http://gerrit.chromium.org/gerrit/1488
Tested-by: Chris Masone <cmasone@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
4 files changed